Etymology
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substantial (adj.)

mid-14c., "ample, sizeable," from Old French substantiel (13c.) and directly from Latin substantialis "having substance or reality, material," in Late Latin "pertaining to the substance or essence," from substantia "being, essence, material" (see substance). Meaning "existing, having real existence" is from late 14c. Meaning "involving an essential part or point" is early 15c. Related: Substantially.

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Definitions of substantial

substantial (adj.)
of considerable importance, size, or worth;
won by a substantial margin
Synonyms: significant
substantial (adj.)
of or relating to the real nature or essential elements of something;
a substantial argument
Synonyms: substantive
substantial (adj.)
having substance or capable of being treated as fact; not imaginary;
the substantial world
a mere dream, neither substantial nor practical
The wind was violent and felt substantial enough to lean against
Synonyms: real / material
substantial (adj.)
providing abundant nourishment;
ate a substantial breakfast
Synonyms: hearty / satisfying / solid / square
substantial (adj.)
of good quality and condition; solidly built;
several substantial timber buildings
Synonyms: solid / strong
substantial (adj.)
having an abundant supply of money or possessions of value;
a substantial family
Synonyms: affluent / flush / loaded / moneyed / wealthy
From wordnet.princeton.edu